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National Geologic Map Database

Geologic Unit: Heath

Usage:

Heath Formation of Big Snowy Group (MT*,ND*)
Heath Shale of Big Snowy Group (MT*)


Subunits:

(alphabetical) --all in MT: Bear Gulch Limestone Member, Tyler Sandstone Member.


Geologic age:

Late Mississippian (Chesterian)*


Type section, locality, area and/or origin of name:

Type section: north flank of Big Snowy Mountains, in sec. 6, T. 12 N., R. 20 E., Fergus Co., MT (Scott, 1935).


AAPG geologic province:

Central Montana uplift*
Powder River basin*
Williston basin*
Montana folded belt*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).